Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Abstract

TiO 2 nanoparticles (NPs) were synthesized by sol-gel methods using two different precursors, titanium tetraisopropoxide and potassium titanium oxalate (KTO). The precursors had a profound influence on the structural, morphological, dielectric and magnetic properties of synthesized TiO 2 NPs, as evidenced by the XRD, FE-SEM, TEM, LCR and VSM studies in the synthesized samples. Alkoxide-derived TiO 2 NPs contained mostly mixed phases of anatase and rutile, whereas KTO-derived TiO 2 NPs contained anatase and Magnéli phases (Ti n O 2n-1 ). After heat treatment at 550 °C, the crystallite size of KTO-derived NPs was lower than alkoxide-derived TiO 2 NPs. The synthesized nanoparticles were spherical and agglomerated having anatase and rutile phases with different proportions in the microstructure of the alkoxide sample. Dielectric constant of the KTO-derived NPs was higher than the alkoxide-derived NPs. Diamagnetic behavior of KTO-derived NPs was also higher than the alkoxide-derived TiO 2 NPs. Keywords: TiO 2 nanoparticles, sol-gel, dielectric constant, grain size, anatase. Resumo Nanopartículas (NPs) de TiO 2 foram sintetizadas por métodos de sol-gel usando dois diferentes precursores, tetraisopropóxido de titânio e oxalato de potássio e titânio (KTO). Os precursores tiveram profunda influência nas propriedades estruturais, morfológicas, dielétricas e magnéticas das NPs de TiO 2 sintetizadas, como evidenciado pelos estudos de DRX, FE-MEV, MET, LCR

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

“…3). The solgel method is commonly used to synthesize TiO 2 nanoparticles, and the most commonly used precursors are titanium(IV) tetraisopropoxide (TTIP), titanium chloride, titanium(IV) tert-butoxide, bis (cyslooctatraene) titanium, tetraisopropylorthotitanate (TIPT), potassium titanium oxalate (KTO), butyl titanate (TBT), and titanium(IV) butoxide (Morales et al 2013;Singh et al 2017). During this process, the formation of colloid is as a result of hydrolysis and polycondensation reactions.…”

Effect of annealing temperature on structural, optical, and photocatalytic properties of titanium dioxide nanoparticles

“…However, aggregation was evident in the samples and was more pronounced at the annealing temperature of 750 C. The particle sizes that can be recognized on a nanometer-scale are the primary particles, and their agglomerations are termed secondary particles. The agglomerations might be due to the overlapping of the small and medium particles, which have been caused by various kinds of forces such as weak surface force (soft agglomerates), strong chemical bonds (hard agglomerates), and lack of water on the surface structures [16,27]. The annealing temperature interferes with the crystal structure and the material's morphology, which affects the specific surface area.…”

Role of Anions in the Synthesis and Crystal Growth of Selected Semiconductors

“…Semisphere particles of about 20 nm were obtained when TiCl 4 was used whereas for the case of Ti(OCH(CH 3 ) 2 ) 4 , highly agglomerated CeO 2 particles were obtained. Singh et al (2017) synthesized TiO 2 via sol-gel method using K 2 TiO(C 2 O 4 ) 2 ·2H 2 O and Ti(OCH(CH 3 ) 2 ) 4 . NH 4 OH was added to K 2 TiO(C 2 O 4 ) 2 ·2H 2 O solution and stirred at room temperature and diethanolamine was added in the Ti(OCH(CH 3 ) 2 ) 4 solution.…”